Newbie Question on YZ timing
Posted November 09, 2004 - 08:34 AM
The bike runs every bit as good as my friends WR450F that is not YZ timed.
I decided to give a try to changing the timing back to WR timing to see if it may suit my riding style and riding conditions. I researched it through the search function of the TT forum and it all looked pretty straight forward allowing about an hour to an hour and a half.
I pulled the timing plugs and rotated the engine to where the 'I' of the "HI" lined up with the marks on the sight window.Now's where I'm confused , both cam gears, Intake and Exhaust, punch marks appear that both the intake and exhaust cams are advanced (the punch marks on the left side of both gears are 5-6mm above the VC mounting surface and below the mounting surface on the right side). Is this possible?
Will taking out the tensioner alone allow enough slack for the chain to come of the crank gear and the timing be changed?
Am I reading too much into this easy task.Any help will be greatly appreciated!
Posted November 09, 2004 - 10:37 AM
To answer your second question, no, taking the tension off of the cam chain will not let the chain drop off of the crank. If you remove the exhaust cam to retime, this is when it can fall off of the crank.
Posted November 11, 2004 - 03:06 PM
Let me start by telling you, you will be sorry for switching back to stock WR timing. The reason your friends 450 is not YZ timed, is because you can not yz time the WR450's. Remember he has a 450, you have a 400, may not seem much, but those extra 50cc make a huge difference, add in the fact they have different cams as well. Just my 2 cents worth